Improvement in window-cleaning step-chairs



UNITEDSTATES PATENT FFICE.

ANNA DORMITZER, 0F NEV YORK, N. Y.

IMPROVEMENT IN WINDOW-CLEANING STEP-CHAIRS.

Specification forming part of Letters Patent No. 206,936, dated August13, 1878' application filed April 16, 1878.

To all whom it may concern:

Beit known that I, ANNA DORMITZER, of the city, county, and State of NewYork, have invented a new and Improved Window-Cleaning Step-Chair, ofwhich the following is a specification Figure l is afront elevation ofmyimprovcd window-cleanin g chair. Fig. 2 is a vertical section taken online a: :c in Fig. 1. Fig. 3 is a plan View. Fig. 4 is an invertedsectional plan View. Fig. 5 is a detail sectional view of the jointbetween the seat and lower support.

Similar letters of reference indicate corresponding parts.

My present invention is an improvement on the window-cleaning chair forwhich Letters Patent No. 200,441 were granted to me February 19, 1878.

The object of my present invention is to render the window-cleaningchair lighter and more portable, to simplify its adjustment, and torender it stronger and more reliable and complete.

Referring to the drawings, A is a platform of a suitable size to sit orstand upon, and B is the back or guard, hinged to one end of theplatform, and supported and rstiffened, when unfolded, by a piece, C,which is attached to the end of the platform and projects a shortdistance above it.

Upon the opposite end and opposite side of the platform A a piece, D, issecured, from which the strips/E extend along' the under surface of theplatform at its edges for receiving the rod a, upon which the bracebswings, and for receiving the rod c, upon which the step-support d ispivoted. d

Astep, e, is attached to the support d by means of brackets f, andbetween these brackets a frame, g, having slots h, is fitted. The fra-meg is clamped to the support d by bolts e', which are provided withwing-nuts j.

The frame g is provided with feet k, which rest upon the door when thedevice is in position in a window.

Chains m are attached to the brace b a short distance from its pivot,and run through an apertured piece of wood or staple, l, secured to theunder side of the platform A, and are attached to the hooked end of abolt, n, that extends through the piece D to receive a wingnut, 0. Bymeans of this bolt and cha-in the brace b is drawn against the wall soas to se curely hold the platform A against downward pressure.

Instead of employing a bolt with a hookhead, as described, I may employa long screw, a, as shown in Fig. 4, journaled in the front piece D andin a block, b', attached to the under side of the seat, said screwhaving a winged head for conveniencein turning. Upon the screw is placeda traveling-nut, c', which is provided with two snap-hooks for receivingthe chain m.

The end of the screw a may be squared to receive a key for turning it,in which case the screw will not project beyond the surface of the pieceD.

Instead of a single central screw, I may place one at each side of theplatform and attach one chain to each nut; but the single screw ispreferable, as both sides of the brace may be drawn into contact withthe wall at one operation.

The back or guard B is provided with screws or studs c', which areengaged by the curved wires f', which are attached to the seat A, andserve to support and render secure the back or guard B. The wires alsoserve to hang the vessels which contain the articles used in cleaningthe window. The board d may be provided with studs or screws e', whichmay be engaged by curved wires ff, as in the case of the back B.

The edges of the platform A are grooved to receive the rods or braces q,which are secured by the half-round metallic covers o', which arefastened to the edges of the platform by means of screws. 'Ihe metalliccovers o are provided with thumb-screws p for holding the braces in anyrequired position, and they are also provided with spring-catches ordetents,which prevent the braces from escaping from the grooves in theedges of the platform.

The braces q are bent at right angles, so that they may engage the innersurface of the wall at the sides of the window. A folding step, A', ishinged to the front edge of the platform A, and has projecting ends,which are supported when in use by the brace-rods q. This step may behinged to the board d and may be supported by folding' brackets.

The chair is pnt into position for use by unfolding it and placing theplatform E on the window-sill and drawing the chain, by means of thescrews, so as to bring the brace b into contact with the outside of theWall. The braces q are now brought against the inner side of the wall,and are clamped by the thumb-screws p. The frame q is now moved downuntil the spurs with which its feet are provided enter the oor. Theguard or back B is raised into a vertical position, when the chair isready for use.

The chair is folded, when it is desired to store it away, by reversing,`the process just described.

Having' thus described my invention, Iclaiin as new and desire to secureby Letters latenti l l 1. In a window-cleaning chair, the combination ofthe hooked screw fn, chains m, and brace b, substantially as shown anddescribed.

2. As a new article of manufacture, the herein-described window-chair,provided with curved Wiresf j" attachedto seat, to serve as braces tothe back and a support to vessels used in cleaning windows.

3. The right-angled braces q, in combination with the platform A, havinggrooved sides, and the metal covers 0, having thumbscrews p,substantially as herein shown and described.

4. The combination, in a window-cleaning chair, of the folding step A'with the platform A, substantially as shown and described.

ANNA DORMITZER.

\\'itnesses:

t. Si-nmvvleh, (liao. M. HOPKINS.

